print(1==1 and 2==2)

print(1==1 or 2==1)

print(not 2==1)

# 0 和 空字符、空集合 作为 判断条件时都被判断为False
a = 0
if a:
    print('a is True')
else:
    print('a is False')

b = ''
if b:
    print('b is True')
else:
    print('b is False')

